Sunday 4 May 2014

Map-Only Jobs In Hadoop


There may be reasons where Map-Only job is needed,Where there is no Reducer to execute.Here Map does all its task with its InputSplit and no job for Reducer.This can be achieved by setting  job.setNumReduceTasks()  to Zero in Configuration.

Job job = new Job(getConf(), "Map-Only Job");
job.setJarByClass(MaponlyDriver.class);

job.setMapOutputKeyClass(LongWritable.class);
job.setMapOutputValueClass(Text.class);

job.setOutputKeyClass(IntWritable.class);
job.setOutputValueClass(Text.class);
/*
 * Set no of reducers to 0
 */
job.setNumReduceTasks(0);

job.setMapperClass(Mapper.class);

job.setInputFormatClass(TextInputFormat.class);
job.setOutputFormatClass(TextOutputFormat.class);

FileInputFormat.addInputPath(job, new Path(args[0]));
FileOutputFormat.setOutputPath(job, new Path(args[1]));

boolean success = job.waitForCompletion(true);
return(success ? 0 : 1);

This sets Reducer task to 0 and turns off the Reducer.

job.setNumReduceTasks(0);

So the no. of output files will be equal to no. of mappers and output files will be named as part-m-00000.

And once Reducer task is set to Zero the result will be unsorted.

If we are not specifying this property in Configuration, an Identity Reducer will get executed in which the same value is simply emitted along with the incoming key and the output file will be part-r-00000.



Happy Hadooping ...

188 comments:

  1. In what types of situations might it be ideal not to run any reducers?

    ReplyDelete
    Replies
    1. For image processing and all we dont need to run a reducer and even in some preprocessor techniques in dataMining while chaining different jobs there are situation where we dont need a key(Nullwritable key) but only values. In that situation if we dont want output in a single file we can run the job without reducers.

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